The results indicated that the growth of 3-year-old Prunus salicina was significantly higher than that of the other species, such as 139.1% and 153.7% higher than Toona sinensis and Juglans regia in height growth, respectively. The maximum percentage of DBH more than 1.0 cm was 91.9% for P. salicina. Next were 49.5% and 48.8% for Ulmus pumila and Pteroceltis tatarinowii, respectively. The contents of total N, total P and total K ranged from 1.36% to 2.52% in the leaves of testing species. The highest content of total N and total P was found in the leaves of Catalpa bungei, while the highest content of total K was observed in P. saltcina leaves. The results indicated that P. salicina, P. tatarinowii, U. pumila had well adaptability on the Karst area both in the growth status and the improvement to the soil with the fallen leaf.
结果表明：(1)3年生冰脆李的生长量明显优于其他树种，其高生长比香椿、核桃分别大139.1%和153.7%；植株胸径大于等于1.0 cm株数的百分比以冰脆李最高达到91.9%，其次是榆树和青檀，分别是49.5%和48.8%；(2)8个树种落叶的全N、全P和全K的总含量变动为1.36%~2.52%，其中全N、全P含量以滇楸最高，全K含量以冰脆李最大；(3)从各树种落叶前后各元素含量及其转移情况看，冰脆李、青檀表现出对大部分营养元素具有较高的循环利用养分或保持养分的能力，而香椿及刺槐相对较弱。
The results indicated that the stand form was even 2 years after intermediate cutting, the young tree species appeared, the stand structure became more reasonable, the growth of tree height and DBH increased by 26% and 28% respectively.
结果表明，抚育间伐2a后云南松林相较为整齐，林内乔木幼树出现，林分结构更加合理，林木生长加快，其树高增幅达26%，胸径增幅达28%。
Result showed that, with the planting generation increased, tree height, DBH and log volume decreased.
多重比较结果表明各代之间的树高、胸径、材积差异均达到了极显著的水平。
Of variation of the individual tree volume. Superior family selection for pulpwood purpose The genetic progress of the equal emphasis weights and restricted index, Ⅰ=〓, which were comprised of DBH, height, basic density, fibre length and holo-celouse, and growth emphasis restricted index, 〓〓, was the highest and the expected genetic progress for each individual trait in both indices was reasonable.
纸浆材优良家系选择和育种程序由胸径、树高、基本密度、纤维长度和综纤维素含量5个性状构成的等权重约束选择指数方程I=0.2751X〓+0.5215X〓-4.2408X〓+1.7437X〓+10.9114X〓及以生长为主的约束指数方程I=2.6420X〓+3.7782X〓-42.9166X〓+14.1762X〓-15.8136X〓的指数遗传进展最高，且各性状的期望遗传进展也比较合理。
The results of there were significant variation among provenances in tree growth measurement of 13-year-old trail stand showed that height, dbh and volume increment, the genetic variation coefficients were 12.91%, 23.51% and 48.51% and the broad-sense heritability were 0.51, 0.65 and 0.60, respectively.
从落羽杉原产地美国6个州引进19个落羽杉（包括4个池杉）种源，以国内早期引种的河南鸡公山落羽杉（CK1）和池杉（CK2）为对照，于1993年3月在江苏东海进行种源试验造林。
At the same site quality class the DBH growth of Pinus koraiensis, Picea rubens and Abies alba was better than the average value of the same coniferous tree species in northeastern primary forests obviously. The difference became more clearly after the middle period of tree growth.
4过伐林红松、云杉材积和胸径总生长量明显好于相同地位级的东北地区原始林平均水平，这种差异在林木生长中期以后表现更为明显。
Main conclusions from the study were as follows: Genetic variations among growth, stem-form and wood traits Variance analysis revealed that DBH, height and individual tree volume were significantly differed from 5 yr to 15 yr among Larix kaempferi families, and so were among individuals within a family, which mean that there was big potential either for individual selection or families selection and they were the major sources for its genetic improvement. Among families, there were very significant differences in the main-branch length, bark thickness, and holo-celouse; there were significant differences in the main-branch diameter, crown width, fresh-branch diameter, fresh-branch number, wood basic density, fiber length of early and late wood, wall/lumina of early and late wood; and there were significant differences in the 1% NaOH extract at 10% level as well.
本文以湖北省建始县15年生日本落叶松自由授粉家系子代测定林为对象，以纸浆材培育为目标，全面、系统地研究了日本落叶松家系生长、干形和材质性状的遗传变异规律，首次从数量遗传理论和生物数学两个方面探索了日本落叶松家系生长变异及遗传增益的预测，在常规育种逻辑方法应用方面，注重育种的效率和效益；建立了家系树高生长模型，分析了遗传参数随时间变化的动态趋势，并借助多性状选择指数首次为南方亚热带落叶松新引种区筛选出一批生长、干形和材质兼优的纸浆专用材家系和个体。
The average of the DBH, height, individual volume, wood basal density and fibre length of those selected clones of Chinese fir were 16.8cm,
根据杉木无性系培育目标，选择出一批生长、材性兼优的杉木无性系以供生产上应用。12年生人选杉木无性系平均胸径、树高和单株材积、木材基本密度和纤维长分别为16.8cm、11.0m、0.1331立方公尺、0.3193g？
It is two times of average height and increment of DBH of indigenous mason pine species, 23% blooming for every plant.
与乡土树种马尾松相比，木麻黄的平均高、胸径生长量是马尾松的2倍，开花株率23%。
The relationships among 5 competition index and DBH, tree height and crown length have been established.
选取5种竞争指标，建立人工落叶松林木胸径、树高和冠长与各竞争指标间的相关关系。
Significant positive correlations were observed between the leaf △ value and the growth traits including tree height, DBH, total number of lateral branches, and length of the strongest lateral branch, which indicated that the provenances with higher growth rate and denser crown had larger leaf △ value.
种源叶片△值与其树高、胸径、一级侧枝总数和最大侧枝长等皆呈显著正相关，树冠浓密的速生种源具有较高的△值。
Judged by the important valuecalculated based on the individuals with DBH≥3 cm, major tree species were Cyclobalanopsis glaucoides, Pistacia weinmanni f olia, Neolitsea homilantha and Olea yunnanensis.
依据两个10000m^2森林样地的调查，在两个样地内分别记录到植物95科142属的163种和70科110属的125种，其中，草本物种最多，乔木次之，藤本较少。
The results were as follows: 1 There were 7133 trees, belonging to 23 species and 18 genera and 13 families, and their average DBH, crown and height were respectively 27.59 cm, 4.10 m and 6.94 m. In general their average crown was relative small. 2 S, H (Shannon-Wiener index), and D of biodiversity index were small, and there were the obvious difference in those indexes among different streets, which suggested that there were certain monotone of the tree species and structure layer. 3 The dominant species mainly consisted of evergreen trees that were Ficus virens var. sublanveolata, Ficus benjamina, Roystonea regia, Terminalia hainanensis, T.
结果表明：1梅州城区行道树共有13科18属23种7133株，其平均胸径、平均冠幅、平均树高分别为27.59cm，4.10m，6.94m，总体上看，平均冠幅偏小；2物种丰富度指数S、Shannon-Wiener指数H和Simpson指数D偏小且各道路间差异明显，说明各道路行道树存在一定程度的物种单一性、层次的单调性；3梅州市城区行道树优势树种是大叶榕、垂榕、大王椰子，次优势种为海南榄仁、阿珍榄仁、阴香，它们是梅州城市街道绿化的好树种。
2Based on piecewise polynomial to develope 3 models of branch, there is a resulting close reletivity between branch diameter and the branch deepinto the crown, DBH, HT, and crown lengthCL3 branch models according to DINC, DBH, and HT as independent variables were provided; there is a high significance between branch chord length and branch length, the relationship can be described by the form of logarithm; a multiple linear equation was used to express the relationship between branch angle of origin and total DINC, DBH, crown radius and HT. Branch angle of origin generally distributed between 20 degree to 50 degree which can reach more than 60%in quantity, different spcecies had different proportion.
多数树种的相关系数R相对较低，只有白桦和枫桦较高，超过了0.9.2、用分段的多项式所建立的枝条基径的三种模型，得出基径和枝条的着枝深度、胸径、树高和冠长之间有密切关系：建立的三种枝长模型是以树木的着枝深度、胸径和树高为自变量的；弦长与枝长之间是极显著的线性关系，可用对数形式来描述；枝条的着枝角度与总着枝深度、树木胸径、实测树冠半径、树高等因子的关系可以用多元线性方程来表示；着枝角普遍都分布在20～50度之间，这个区间的分布比例一般都能达到枝条数量的60%以上，不同树种的比例不太相同。
It`s necessary to have a simple and systematic digital model in thinning decision-making. In the paper, the tree location map of 150 m x 30 m Luanta-fir in Hui-Sun Forest Experimental Station were digitized in GIS and thinning simulation by random, Telathaki-Wadali-Chi, DBH class and crown competition index method.
本研究系利用GIS 配合林木位置图，以惠荪林场之150m x 30m 香杉采穗园为研究材料，以生产大径材为目的的考量下，针对疏伐木之选择，利用随机法、寺崎渡氏法、胸径级法、树冠指数法等四种方法加以模拟、评估、探讨。
The author took analysis data of coniferous trees which were major in Jingouling Forest Farm, Wangqing Forest Bureau, Jilin province, including Pinus koraiensis, Picea rubens and Abies alba as research objects, and then analyzed the growth process of main coniferous trees in over-cutting forests in Changbai Mountains. The author used a lot of study methods, for example comparing annual increment and average increment of individual growth factors, dividing growing stages, and giving appropriate growth curves, and then compared the corresponding results with those of primary forests. The results were as follows:(1) The annual increment`s maximum value of diameter at breast height and height of Pinus koraiensis, Picea rubens and Abies alba appeared in about 80 years. The annual increment`s maximum value of DBH of Pinus koraiensis appeared later than that of H, while for Picea rubens and Abies alba, the two factors appeared nearly at the same time.
本文以汪清林业局金沟岭林场采集的解析木为主要研究资料，对红松、云杉和冷杉这三种金沟岭林场主要针叶树，通过比较连年生长量和平均生长量、划分生长阶段、拟合生长过程以及和原始林作比较研究等方法，研究了长白山过伐林主要针叶树种的生长过程，结果表明：(1)红松、云冷杉胸径和树高连年生长量的最大值大致出现在80年左右，红松胸径连年生长量到达最大值的时间要比树高晚一些，云冷杉胸径和树高到达最大值的时间大致相同。
By means of multiple comparisons, it was found that the differences among tree height, DBH and lo...
连作后土壤的物理性状的变化不大，随林地代数的增加，土壤容重略有增大，毛管持水量、毛管孔隙度没有一定规律性。
Results showed that the mean basal area of trees ≥10 cm diameter at breast height (DBH was markedly lower in the secondary forest than in the primary forest, whereas the density of seedlings (cm DBH, ≥50 cm tall), saplings (2~9.9 cm DBH), and trees were all significantly higher in the former.
结果显示次生林中成树（≥10 cm胸径）的平均胸高断面积要显著低於原始林，而苗木（ cm胸径，≥50 cm高）、稚树（2~9.9 cm胸径）及成树的密度都高於原始林。
On the basis of the prediction model, sapwood area can be calcalated by DBH.
通过实测标准地的胸径分布，可以推算出林地边材面积的分布。
CommunityⅠ, with the least protection, had less species richness and DBH than the other two.
经F检验表明3种群落的丰富度和立木胸径都有极显著差异(P.001)。